We report an efficient transient stimulated Raman conversion of high-energy picosecond pulses at 1350 nm into the eye-safe 1500-nm wavelength range by use of a KGd(WO4)_2 crystal. The conversion efficiency into either 1503- or 1537-nm radiation (767- or 901-cm^-1 Raman modes, respectively) is measured to be ∼10% in a single-pass configuration. The transient Raman gain coefficient is found to be ∼0.8 cm/GW. Simultaneous generation of multiple Raman lines is also observed.
© 2005 Optical Society of America
(190.4400) Nonlinear optics : Nonlinear optics, materials
(190.5650) Nonlinear optics : Raman effect
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(290.5910) Scattering : Scattering, stimulated Raman
Arkady Major, J. Stewart Aitchison, Peter W. E. Smith, Nigel Langford, and Allister I. Ferguson, "Efficient Raman shifting of high-energy picosecond pulses into the eye-safe 1.5-µm spectral region by use of a KGd(WO4)_2 crystal," Opt. Lett. 30, 421-423 (2005)